S
M
T
W
T
F
S
29
44°
26°
30
45°
23°
1
44°
21°
2
39°
22°
3
39°
23°
4
41°
24°
5
43°
22°
6
41°
20°
7
38°
17°
8
34°
19°
9
35°
18°
10
37°
18°
11
36°
17°
12
34°
5°
13
36°
2°
14
37°
8°
15
23°
6°
16
30°
4°
17
25°
5°
18
21°
10°
19
35°
14°
20
24°
6°
21
19°
5°
22
27°
8°
23
Hist. Avg.
29°
11°
24
Hist. Avg.
29°
11°
25
Hist. Avg.
29°
11°
26
Hist. Avg.
28°
11°
27
Hist. Avg.
28°
10°
28
Hist. Avg.
28°
10°
29
Hist. Avg.
28°
10°
30
Hist. Avg.
28°
10°
31
Hist. Avg.
28°
10°
1
Hist. Avg.
27°
10°
2
Hist. Avg.
27°
10°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Sioux Falls
Sioux Falls's December 2026 forecast shows daily high temperatures ranging from 19° to 45°, with overnight lows between 2° and 26°. The average high for December is 34° with an average low of 14°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Sioux Falls. See also: January | February | March.
